滚动表视图然后突然单击搜索栏会导致应用程序崩溃？

Posted 2023-03-12

【中文标题】滚动表视图然后突然单击搜索栏会导致应用程序崩溃？

【英文标题】：Scrolling Table view and then suddenly click on search bar causes app to crash?

【发布时间】：2012-06-01 10:50:41

【问题描述】：

我已经在表格视图中实现了搜索栏和搜索文本。我遇到的问题是，当我滚动表格视图然后突然单击搜索栏会导致应用退出。

知道如何在点击搜索栏时停止滚动。

我的代码如下：

    - (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar

 NSLog(@"becomes first responder");
 [table setScrollEnabled:NO];
 return YES;
// return NO to not become first responder

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar

 isSearchOn=YES;


- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar

 searchBar.text=@"";
 isSearchOn=NO;
 [searchBar resignFirstResponder];
 [table setScrollEnabled:YES];


- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText

 if ([searchText length]>0) 
  isSearchOn=YES;
 else
  isSearchOn=NO;

 NSLog(@"search text %@",searchText);
 [self searchText:searchText];
 [table reloadData];


- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar

 NSLog(@"end editing called.....");
 searchBar.text=@"";
 [table setScrollEnabled:YES];


- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar

 [searchBar resignFirstResponder];




    -(void)searchText:(NSString*)str

 NSLog(@"search text");
 [resultArray removeAllObjects];


 if (segmentControl.selectedSegmentIndex==0) 
  for (NSDictionary *CellDix in FriendSuggestion) 
  
   NSRange titleResultRange =  [[CellDix valueForKey:@"itemid.item"] rangeOfString:str options: (NSCaseInsensitiveSearch | NSLiteralSearch)];

   NSRange titleRangePopular=[[CellDix valueForKey:@"usagecategoryid.usagecategory"] rangeOfString:str options:(NSCaseInsensitiveSearch | NSLiteralSearch)];

   if (titleResultRange.length > 0 || titleRangePopular.length>0)
    [resultArray addObject:CellDix];
  
 else
 
  for (NSDictionary *CellDix in popularSuggestion) 
  
   NSRange titleResultRange =  [[CellDix valueForKey:@"itemid.item"] rangeOfString:str options: (NSCaseInsensitiveSearch | NSLiteralSearch)];

   NSRange titleRangePopular=[[CellDix valueForKey:@"usagecategoryid.usagecategory"] rangeOfString:str options:(NSCaseInsensitiveSearch | NSLiteralSearch)];

   if (titleResultRange.length > 0 || titleRangePopular.length>0)
    [resultArray addObject:CellDix];
  
 

【参考方案1】：

单击搜索栏将在 isSearch bool 变量上，因为 U 将在 cellforRowAtIndexpath 中应用条件将调用并检查 isSearch 然后它相应地工作并且结果数组将在那里为空，因为你没有在搜索栏上写任何东西即要检查并使用 values 加载和 resultArray 。这就是它退出应用程序的原因，因为它在 cellforRowAtIndexpath 中创建了空数组来填充单元格值。所以更好的是你必须在搜索栏中的 textDidChange 上而不是在 searchBarTextDidBeginEditing 委托方法中使用 isSearch。所以评论这个方法。

  - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
    
     isSearchOn=YES;